﻿using System;
using System.Data;
using System.Configuration;
using System.IO;
using System.Text;
using System.Security.Cryptography;
/// <summary>
/// Encrypt 的摘要说明
/// </summary>
namespace Business
{
    public class EncryptHelper
    {
        public EncryptHelper()
        {
        }
        //默认密钥向量
        private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

        private static string encryptKey = "WoChulix";//密钥,要求为8位

        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥,要求为8位</param>
        /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
        public static string EncryptDES(string encryptString)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                return encryptString;
            }
        }



        /// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
        public static string DecryptDES(string decryptString)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return decryptString;
            }
        }

        public static string EncryptDES2(string encryptString)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                TripleDESCryptoServiceProvider TCSP = new TripleDESCryptoServiceProvider();
                //DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, TCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write); // new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                return encryptString;
            }
        }
        //12个字符  
        private static string customIV = "4vHKRj3yfzU=";
        //32个字符  
        private static string customKey = "xhVs6DRXLfUGxw+AhtfQdpQGoa+8SA9d"; 
        public static string E3(string password)
        {
            string encryptPassword = string.Empty;

            SymmetricAlgorithm algorithm = new TripleDESCryptoServiceProvider();
            algorithm.Key = Convert.FromBase64String(customKey);
            algorithm.IV = Convert.FromBase64String(customIV);
            algorithm.Mode = CipherMode.ECB;
            algorithm.Padding = PaddingMode.PKCS7;

            ICryptoTransform transform = algorithm.CreateEncryptor();

            byte[] data = (new System.Text.ASCIIEncoding()).GetBytes(password);
            MemoryStream memoryStream = new MemoryStream();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, transform, CryptoStreamMode.Write);

            cryptoStream.Write(data, 0, data.Length);
            cryptoStream.FlushFinalBlock();
            encryptPassword = Convert.ToBase64String(memoryStream.ToArray());

            memoryStream.Close();
            cryptoStream.Close();

            return encryptPassword; 
        }
    }
}